Penetration Testing mailing list archives
RE: Emulating a wireless access point
From: bparis () sorrentolactalis com
Date: Wed, 15 Aug 2001 12:42:41 -0400
You are correct Meredith. I live near a cell tower (100m away) and can clearly hear cell conversations on my scanner at the 1st lower harmonic, app 450-460Mhz. Getting back the the original question, cordless 2.4Ghz phones are notorious for creating interference with other devices using the same freq band. I recommend not operating 2.4Ghz phones in a wireless environment. William S. Paris Telecommunication/Network Analyst Sorrento Lactalis Inc. bparis () sorrentolactalis com Actually, it probably has to do w/ the frequency / harmonic resonance of the phone interfearing w/the AP ... not the proximity. Even if the phone operates on a different frequency, it can interfere w/ the AP via harmonic resonance. Harmonic Resonance occurs when one of the frequencies is a multiple of the other. Say your AP operates at 2 hz ( for simplicity sake) and your phone operates at 4 hz, then every other cycle of the phones frequency will be in phase w/ the access points. ASCII Diagra: | x -- sine peak As you can see, the sine waves are prefectly | | | | | Phone in-phase at 2 and 4 w/ respect to the phone. | | | | | | | | | | | | | | |_________________________________ T = 1 sec | | x -- sine peak | | | | ....| |.....| |. Access Point | | | | | __________________________________ T = 1 sec Are there any Ham operators out there that can confirm or deny this? -- Meredith Shaebanyan ---------------------------------------------------------------------------- This list is provided by the SecurityFocus Security Intelligence Alert (SIA) Service. For more information on SecurityFocus' SIA service which automatically alerts you to the latest security vulnerabilities please see: https://alerts.securityfocus.com/
Current thread:
- Re: Emulating a wireless access point, (continued)
- Re: Emulating a wireless access point Thorsten Fischer (Aug 14)
- RE: Emulating a wireless access point Jason Lewis (Aug 14)
- RE: Emulating a wireless access point Jason Brvenik (Aug 14)
- RE: Emulating a wireless access point Meredith S (Aug 15)
- Re: Emulating a wireless access point Al Potter (Aug 15)
- RE: Emulating a wireless access point Meredith S (Aug 15)
- Re: Emulating a wireless access point Michael Boman (Aug 16)
- RE: Emulating a wireless access point Meredith S (Aug 15)
- RE: Emulating a wireless access point Nicholas de Jong (Aug 14)
- RE: Emulating a wireless access point Jason Lewis (Aug 15)
- RE: Emulating a wireless access point Artes, Francisco (Aug 15)
- RE: Emulating a wireless access point bparis (Aug 15)
- Re: Emulating a wireless access point David Ford (Aug 15)
- Re: Emulating a wireless access point Marc Mosko (Aug 16)